微电网混合储能功率分频控制策略研究

Study on Control Strategy of Power Fractional Frequency with Hybrid Energy Storage of Microgrid

针对独立光伏发电系统中混合储能方式能够同时具有高功率密度和高能量密度的特性,提出一种微电网混合储能功率分频控制策略来提高系统运行的稳定性。通过Simulink平台搭建了独立光伏发电混合储能系统,通过对功率分频实现了超级电容器和锂离子电池的功率输出优化分配,抑制了由于负荷突变引起的功率波动,维持了直流母线电压的稳定。仿真结果表明,该方法提高了系统的稳定性,实现了对直流负载的可靠供电。

In allusion to that hybrid energy storage system (HESS) possesses the advantages of high power density and high energy densitysimultaneously in the stand-alone photovoltaic power generation system, this paper proposed a kind of control strategy of power fractional frequencywith hybrid energy storage of microgrid to improve the stability of the system operation. A HESS for stand-alone photovoltaic powergeneration system was built by simulink. Via power fractional frequency, the system realized the optimal allocation of power output of supercapacitorand lithium ion battery, suppressing the power fluctuation caused by load change and maintaining the stable DC bus voltage. The simulationresults show that this method improves the system stability and realizes the reliable power supply for direct current load.